1 files changed, 88 insertions, 0 deletions
diff --git a/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/main/ApexEngineServiceHandler.java b/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/main/ApexEngineServiceHandler.java
new file mode 100644
index 000000000..ad7af9449
--- /dev/null
+++ b/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/main/ApexEngineServiceHandler.java
@@ -0,0 +1,88 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * 
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.apex.service.engine.main;
+
+import org.onap.policy.apex.model.basicmodel.concepts.ApexException;
+import org.onap.policy.apex.service.engine.engdep.EngDepMessagingService;
+import org.onap.policy.apex.service.engine.event.ApexEvent;
+import org.onap.policy.apex.service.engine.runtime.EngineService;
+import org.slf4j.ext.XLogger;
+import org.slf4j.ext.XLoggerFactory;
+
+/**
+ * The Class ApexEngineServiceHandler holds the reference to the Apex engine service and the EngDep
+ * service for that engine. It also acts as an event receiver for asynchronous and synchronous
+ * events.
+ */
+public class ApexEngineServiceHandler {
+    // The logger for this class
+    private static final XLogger LOGGER = XLoggerFactory.getXLogger(ApexEngineServiceHandler.class);
+
+    // The Apex engine service, the Apex engine itself
+    private final EngineService apexEngineService;
+
+    // The interface between the Apex engine and Apex policy deployment for the Apex engine
+    private final EngDepMessagingService engDepService;
+
+    /**
+     * Instantiates a new engine holder with its engine service and EngDep service.
+     *
+     * @param apexEngineService the apex engine service
+     * @param engDepService the EngDep service
+     */
+    ApexEngineServiceHandler(final EngineService apexEngineService, final EngDepMessagingService engDepService) {
+        this.apexEngineService = apexEngineService;
+        this.engDepService = engDepService;
+    }
+
+    /**
+     * This method forwards an event to the Apex service.
+     * 
+     * @param apexEvent The event to forward to Apex
+     */
+    public void forwardEvent(final ApexEvent apexEvent) {
+        try {
+            // Send the event to the engine runtime
+            apexEngineService.getEngineServiceEventInterface().sendEvent(apexEvent);
+        } catch (final Exception e) {
+            final String errorMessage = "error transferring event \"" + apexEvent.getName() + "\" to the Apex engine";
+            LOGGER.debug(errorMessage, e);
+            throw new ApexActivatorRuntimeException(errorMessage, e);
+        }
+    }
+
+    /**
+     * Terminate the Apex engine.
+     *
+     * @throws ApexException on termination errors
+     */
+    public void terminate() throws ApexException {
+        // Shut down engine management
+        if (engDepService != null) {
+            engDepService.stop();
+        }
+
+        // Shut down each engine instance
+        if (apexEngineService != null) {
+            apexEngineService.stop();
+        }
+    }
+}